Can any one answer my question?

Question

Ac -alternating current. it is sinusoidal. It has zero crossing point.
Consider house voltage of 230v/50hz. whether current (or voltage) in the positive half cycle is only able to glow light or current(or voltage) in the negative half cycle also able to glow light.
50hz - 50 cycles per sec. Tell me only because of this speed (50hz) light is continues. Tell me if 10hz-10cycles per sec is given what happen to light. whether it flickers....

I think because of zero crossing point we can escape in ac.
Tell me where the current or (voltage) willl be zero(at +ve half cycle or-ve half cycle)

Answer 1

Dude,

You have to reword your question. It really doesn't make much sense. Here's my interpretation of the question:

"An AC voltage (230v/50Hz) is applied to a light bulb. If the frequency is reduced to 10Hz will the light flicker?"

Answer is yes. We do not see the 50Hz flicker, because of persistence of vision.

Answer 2

The great thing about a standard light bulb is that it works by pushing electric current through a filament which heats up and glows to produce light. The filament cannot react fact enough to turn-off during the zero crossing and therefore you have no flicker. As you reduce the frequency, you would see your light bulb start to flicker. Lower the frequency enough and you would see it gradually get brighter until it reaches its maximum brightness and then gradually dim until it is off.

The reason that the 50Hz or 60Hz frequencies were picked is because they are fast enough that they eye cannot detect any variations at that frequency. Even a TV or computer monitor will do a complete refresh aprox. 60 times per second.

Now, some electronics equipment sensitive to light CAN detect these fluctuations and are generally designed to reject what is called 60 cycle noise!

Answer 3

Ummm... I think if I understand your question, you're asking what happens to your light if you drop the frequency while keeping the voltage constant. The answer ist hat the light will flicker a little bit, and will dim overall, since the current will drop accordingly. The zero crossing point doesn't really make a difference, since all AC equipment sees this, but at high enough frequency, what the equipment really sees is an average of voltages somewhere between the peak and the zero point (on both the positive and negative side of the curve).

Answer 4

"An AC voltage (230v/50Hz) is applied to a light bulb. If the frequency is reduced to 10Hz will the light flicker?"

Answer is NO. The bulb filament has no time to cool down so it continues to emit photons, it emits photons when is hot like fire does, even when the is no voltage difference at its ends.

Answer 5

it is about the inertial property of the human eye or lite bulb if the frequency will drop you ,l have difficulty to transform the alternative current to a value who is use by the devices you use if you increase f. you have to expensive energy

Answer 6

dude i have an associate degree in electrical and even I DONT KNOW WHAT UR TALKING ABOUT